Turnback apparatus



Dec. 20, 1927. 1,652,998

R. J. BARTHoLoMEw TURNBAGK APPARATUS Filed March 25, 1927 2 Sheets-Sheet l IN VEN TOR.

ATTORNEYS.

Dm@ 2o, 1927.

R. J. BARTH'OLOMEW TURNBACK APPARATUS Filed'March 25, 1927 2 Sheets-Sheet 2 IN V EN TOR.

L (ab A TTORNEYS.

Aic

Patented Dec. 20, 192'?.

narran fsraras noEEE'r J. BAETHQLOMEW, oE-LAivsnALE, rniirisrnvaivin, .a

. *insana ssieiior. fro- ELETCHER vronEs, iivcoizrona'rnn, or r'niiiannnriaia, PENNSYLVANIA, A conroEATioNoE PENNSYLVANIA.

frUENEecE Arnaiafius.

appiicaiion inea March 25,1927. seriai Ne@ irseai.l n

My invention relates' to an improvement in turnback apparatus, and, while capable of'vai'ious applications, will be described particularly in connection with' Jacquard looms, and in this connection` has for Vone or' its objects the provision of means whereby the harness mechanism maybe turned back topickup a brokenthread, orinor any other reason, and the weaving resumed at the right point. j

A further object ofthe inventionis the provision of means for the purpose above mentioned which is extremely simpl-ein construction and in operation although providing the maximum accuracy, lwhich is avery desirable feature in-this type of apparatus.

A still further'object of my invention is the provision ot means'in turiibackappara tus wherein the driven inemberfis turned back a predetermined part ota revolution at each operation, and so arranged 4that if the driven memberis turned back less than this amount, the driven memberfwill automatically find its proper position relative to the driving means when driven in a forward direction. y l A'still further object of 'my invention is theprovision otra turnback in which the turn back is accomplished bya single movement ofthe operator, the driven member being positively vheld in predetermined relation l with respect to the driving means when 'Referring to the driven in a forward direction.

In the accompanying' drawings;y whereinv I have illustrated `an embodiment of my inven tion-L l Y Fig. 1 shows the same'in elevation;

Fig. 2'is a section 'on the line 2-2 ot Fig.1;and

y Fig. 3 is-a part sectional and elevational View.k l

drawings in detail, 1 designates the card cylinderv or driven ymember carried on a shaft 2 and intermittently ro;- tate'd to presentthe successivefaces of the cardstov the needles 3. The shaft 2 cai'fryin'gv the card cylinder is attached to reciprocating vmechanism, designated 4t, this reciprocating mechanism 'moving the card cylinder and its associated mechanism back and Jforth from' right to left, `as viewedgin Fig. 1, so asy to bring the cardcylinder-into proper` operative position 'relatively to the needles. 'y This cony struction is usual-in looms, and v.henceyvill not bedescribed in any further detail. V

yFor the purpose lof rotating the card cylinder or driven member intermittently, I provide the Geneva gear or drivingmea'ns 5, mounted looselyon the shaft2, which is given an intermittent motion by the pin 6 carried by the rotatable drive member 7,

which drive vmember is driven through `a 1 drivechain 8. The drive member 7, I may mention, is reciprocated with' the cardfjcylinder, and for the purpose of' retainingthe proper tension on the drive chain due tothe reciprocating` movement ot' the drivemember 7, I provide gears v9vand 10. Intermediate the Geneva gear' 5 and the card cylinder is a ratchet 11, concentric with "the Geneva gear 5 and integraltherewithl and mounted .on the shaft 2.

Ihejshaft 2 has 'aiiixed' toit a cylinder 'drive' disc 12 and intermediate the ratchet 11 and this cylinder drive disc is a. ratchet Vwheel 13, this ratchet wheel-beingloosely Y mounted on theshatt 2.

Rigi'dly secured'to vthe cylinder drive disc 12 `and passing through a slot 14; inthe ratclil et wheel 13 is a pin 15,r whichpin carries a push pawl 16, this pawl beingfat the side of the Yratchet wheel 13 opposite the cylinder drive disc 12. A spring 17v has one end attached to the push pawl 15, as indicated-at 18, while its other end is attached tothe face of the ratchet wheel 13,-and'the normal op-g erationot'this 'spring is to hold the pawl 16 in. one of the notches -19 in'thezratchet. 11.

-. The-shaft 2 carries a bracket 23, `which forms a support orpivotal bearing yfora reversing lever 24, which lies abovel -the card cylinder kand its associated mechanism, which The'lower side otthe'push pawl: 16has-a i has just heen-described.` yThe reversing lever 24 is inthe form of a bell crank lever, that l is to fsay, its` fulcrum is intermediate its ends,land one end of this lever, that ,is to sion'spring 28. y `versing pawl is forked, as indicated in 141g.

3, and this fork straddles the ratchet wheel 13 when the lever 241s depressed. las vvill be Yhereinafter pointed out. In this forked or bifurcatedend of the reversing 'pawl 27 I provide a pin 29, this pin co-operating with the notches inthe edge or peripheryof the-ratchet wheel 13. A

Although Athe card cylinder 1 has been shown in Fig. 1, for instance,.withrone edge insteadkof a side thereof opposed to the needles 3, it will be understood that this is due to Athe fact thatthe card cylinder and all ofthemechanisni associated therewith,

f as illustrated in Fig. 1, has not been moved to its. extreme right-hand position and that when this vmechanism has been moved toits extreme right-hand position, as viewed in Fig.f1a ila-t face ofthe card .cylinder will be lpresented to the needles so that 'the same may enter the cards thereon. v

In its normal operation the card cylinder or driven Vmember is driven :in a clockwise direction, as viewed in Fig. 1, the driving pin 6 carried by the driving` member 7 engaging the star wheel or Geneva gear', driving the same clockwise, and inasmuch as the ratchet` 11 is integral therewith, Vthe latter will bev driven ina clockwise direction also. At this time, due to the tension of the spring 17, the push pawl lrwill be held in one of the notches in the ratchet 1l, as illustrated in Fig. 1, and consequently, intermittent rotary movement 4will be imparted to the cylinder drive discA 12 through the lpin 15, which, it will be-recalled, vis fastened `.to the drive disc.

Inasmuch as the'drive disc is rigidly secured 'tothe shaft 2, the card cylinder 1 will be intermittently rotated.

Assuming that it is desired to turn'back the card cylinder or driven member, it is merely necessary to depress the reversing leverv24 by pulling downwardly on the operating chain 26.

This draws'the reversing awl'27-'downvvardlyruntil the pin 29 carried y the forked end thereof engages one of the notches `3() in th'eratchet wheel 13. y The f ratchet wheel13 will thus be reversedin di ment with one of the notches in the ratchet 11 so that operative driving connection between the Geneva Vgear 5 and the card cylin' der is broken. A further depression of the reversing lever 24 will continue to rotate the ratchet wheel 13 in4 an anti-clockwise direction until the right-handv end ofthe slot 14, as viewed in Fig. 1, engages the pin 15, y whereupon the pin 15y will be moved anticlockwise, carrying with it the'cylinder drive l disc .12, and. hence the card cylinder 1. The parts areso proportioned that full depression of the reversing lever 24 will rotate the card cylinder in an anti-,clockwise direction the proper or vpredetermined distance. If for any reason 'the lever 24 is not depressed for its full distance, the driven member or card cylinder will be turned back onlyv a part of its .predetermined distance,

and the driven member will automatically I rind' its vproper position relativeto the Vdriving means when the driven mechanism is yturned forward.

If it is desired-to further `reverse the card cylinder, it is merely'necessary to release the operatingl chain 26, allowing the reversing lever 24 to returnto `its originalposition, and then again depress the same.. Assuming, however-, that the Vmechanism has been. turned back the desired amount,"the operating chain 26 is released, 'the reversing` lever 24 rises or returns to the position shown in Fig. 1, and inasmuch as the spring 17 is released due to the movement upwardly of the reversing pawl 27 out of its notch in the ratchet wheel 13, this spring will draw or pull the;v ratchet wheel 13 vin a clockwise direction until the left-hand .end ofthe slot 14-inr the ratchet wheel 13v engages the pin 15, and at the same time the pushv pawl 16 Y will drop downfinto one of the notches in theratchet 11, vso that the mechanism, thatis to say, the card cylinder, will now be driven in a clockwise `or normal direction.

F rom the foregoing it will be seen that- I have provided an apparatus'whereby the harness mechanism of a Jacquard loom may be turned back for any purpose desired,and will always resume weaving at r,the proper point, this being veffected by the simple manipulation of the operating chain 26.

It' will be apparent also thatI have provided ak turnback apparatus in which the driven member and Vdriving means therefor are always in proper predetermined relative positions. y i' It` is evident that various vmodifications may be made in the construction above described. withinthe purview of this invention. Vhat I claim is:

1. In Vaturnback for looms, the combination of' card cylinder, a drive shaft carrying the" same, a cylinder drive disc rigidly attached tosaid .drive shaft, ara-tchat wheel on said shaft, a spring connection between said cylinder drive disc and said ratchetk wheel, a pivoted reverse pawlV adapted to effect reverse movement of said ratchet Wheel thereby to effect reverse 'movement of the cylinder drive disc and card cylinder, Ya pivoted lever for actuating said pawl, and means for manually movingsaid lever about its pivot.

2. In a turnback for looms, the combination of a card cylinder, a drive shaft carry-v ing lthe same, a cylinder drive disc rigidly attached to said shaft, a ratchet wheel loosely mounted on said drive shaft, a coil spring connection between said cylinder drive discv and said ratchet wheel, one endof said spring being Vattached to the drive disc and the other' end to the ratchet wheel, a pivoted reverse pawl carrying a pin at its free end for co-operation with said ratchet wheel, and a pivoted reverse lever carrying said reverse pawl, said reverse lever being manually actuated to eect engagement of'v the reverse pawl with the ratchet wheel thereby to reverse the ratchet wheel, cylinder drivedisc and card cylinder.

3. In aturnback for looms, the combina tion of a card cylinder, a drive shaft carrying the same, a cylinder drive `disc rigidly secured to said shaft, and gearing yieldingly attached to saiddrive disc for driving the latter ina forward or normal direction, and manually operable mechanism for reversing the card cylinder without reversing the said mechanism by which the card cylinder V"is driven in a lforward direction.

4. In a turn-back for looms, the comb1na.

tion of a card cylinder, a drive shaft carry- Y ing the same, a cylinder drivedisc rigidly secured to Said shaft, an intermittent gear operatively connected to said drive'disc for ydriving the card cylinder in a forward'direction, and manually operated means for,

disconnecting the intermittent gear from operative engagement with the drive disc and' to reverse the direction of said drive disc without'reversing vthe direction of rotation ofthe intermittent gear.

5. In a turnback for looms, the combination of a card cylinder, a drive shaft therefor, a cylinder drive rdisc secured to said shaft, a ratchet wheel on said shaft, a ratchet,

- l a pin carried by said drive disc and passing through a-slot in said ratchet wheel, a pawl on said pin and engageable with said ratchet, means for driving said ratchet to drive said drive disc through said pawl, a reverse pawl engageable with said ratchet wheel, and manually. operable means for moving theffirst mentioned pawlfto inoperative position and the reverse pawl to operative .position to effect thereby reversal ofthe lcylinderl drive disc andcylinder.

6."Ina turnback for looms, thecombination ofa card cylinder, Qa' cylinder drive disc attached thereto, an intermittent gear, means for rotating said gear, a ratchet movable with said gear, a pawl carried by said drive discv and co-operable with said ratchet i. aj

an engagement of the reverse pawl with the ratchet wheel to reverse lthe cylinder drive disc and card cylinder. .y

7. In a turnback for looms,- the combination of a card cylinder,a`drive disc for th'e intermediate the ratchet and drive' disc', a

- pin carried by the drive discy and passing through saidv ratchet' wheel, a Vpush pawl carried by said pin and co-operating with said ratchet to effect a driving connection between-the ratchet, ratchet wheel and drive same, a drive ratchet, a reverseratchet wheel disc in a forward direction, a--reverse pawl co-operating with said ratchet wheel for disengaging the rlirst mentioned( pawl from the ratchet and reversal'of. direction of rotation of the `ratchet wheel, drive disc andv card cylinder. f v

8. In a turnbackfor looms, the combination of a cylinder drive disc, a drive ratchet,

a push pawl, a lpin carrying said pawl,

means for driving the ratchetin a forward direction thereby to drive the drive ydisc through said pawl in a forward direction, a

ratchet wheel intermediate the drive disc y;

andv drive ratchet having movement relative to said ratchet, said ratchet wheel being provided with-ayslot for receiving said pawlcarrying pin, means for moving said ratchet wheelreversely Withrespect to said ratchet, a pin carried byl said ratchet wheel and engageable with said push pawl to move the push pawl out of operative position,y and means connecting the ratchet `,wheel and kdrive disc. whereby upon` reversal ofl the.

ratchet wheel the drive disc will be re- `versed.-

- This specification signed this 17th day of February, 1.9727. l

' n.' J. BARTHOLOMEW. 

